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The interplay between itinerant electrons and local magnetic moments inquantum materials brings about rich and fascinating phenomena and stimulatesvarious developments in the theoretical framework. In this work, thermodynamic,electric transport, and neutron diffraction measurements were performed on anewly synthesized honeycomb lattice magnet TmNi$_3$Al$_9$. Based on theexperimental data, a magnetic field temperature phase diagram was constructed,exhibiting three essentially different magnetic regions. Below ${T_{\rm N}=2.97\pm 0.02}\ \rm K$ Tm$^{3+}$ moments order antiferromagnetically in zero field.We found that the Tm$^{3+}$ ions form a pseudo-doublet ground state with theIsing-like moments lying normal to the two-dimensional honeycomb layers.Application of a magnetic field along the easy axis gradually suppresses theantiferromagnetic order in favor of an induced ferromagnetic state above thecritical field ${B_c=0.92 \pm 0.05}\ \rm T$. In the vicinity of $B_c$, a strongenhancement of the quantum spin fluctuations was observed. The quantum Isingnature of the local moments and the coupling to itinerant electrons arediscussed.

Interplay of itinerant electrons and Ising moments in a hybrid honeycomb quantum magnet TmNi$_3$Al$_9$